Trigger Source

Controls: Trigger Dialog >> Source
Macros : TrigSrc=LI, RI, LO, RO

This group of four radio buttons selects the Left or Right Input or Output channel to be monitored for a Trigger event.

The channel you select must be active (as set via the Input or Generator controls) in order to provide a trigger signal, but it does not have to be visible on the display.

A small red square always marks the effective Source button, which may not be the one you selected if that becomes inactive.

If the Source channel becomes inactive (such as if you toggle Input or Generator off, or one of their channels), Daqarta will use an active channel (if any) as the effective Source.

If only one channel is active, that channel will be the effective source no matter what is selected. If only Inputs or Outputs are active (but not both), then these buttons will just act as a Left or Right selector. For example, if both Outputs are active but no Inputs, then setting Left In will have the same effect as Left Out.

Suppose the Generator is supplying Left and Right stimulus signals to your experiment and you are monitoring responses on the Left and Right Input channels. If you have Source set to (say) Left Out and you momentarily toggle the Generator off to see the effect on the input signals, the effective Source (shown by the red indicator) will go to Right In. Then when you toggle the Generator back on, Left Out will again be used, as selected.

Now suppose instead of toggling the Generator off completely, you go the Generator dialog and just toggle off the Left output. In this case, the rule is that the effective Source will be of the same direction (Out, in this case) so it will go to Right Out. Again, when you toggle the Generator Left output back on, the source will return to the selected Left Out.

These buttons are disabled in Gen Sync mode, since the effective source is the Sync system of the Generator.

Macro Notes:

TrigSrc=LI sets Trigger Source to Left Input. Similarly, RI sets Right Input, LO sets Left Output, and RO sets Right Output.

Note that when Trigger Source controls are disabled in Gen Sync mode, these commands may result in the macro aborting with an error message.

See also Trigger Toggle - Introduction, Trigger Control Dialog